To change your site navigation you will need create a ‘Custom Menu’.
The setting for this is in ‘Appearance’, ‘Menus’.
I suggest you name your Custom Menu ‘Menu1’.
You can add Pages, Posts, Custom Links or Categories to your menu.
However, I suggest you don’t add Posts to your menu, else you are likely to get confused between Pages and Posts – use Categories instead if you are using Posts.
The custom menu of this site is shown below, you can see it uses only ‘Custom Links’ and ‘Pages’.
Where a link is indented it indicates that it is a submenu of the main link.
In this menu ‘Custom Links’ are used as headings by entering a ‘#’ character rather that a valid URL.
Categories aren’t used in this site navigation because the content will not regularly change – and therefore it does not need to be a blog.
If I was creating a site with four blog areas, I would add Categories to the menu.
In the example below each ‘Category’ would present a different blog – each showing the latest post first.
Menu Settings
In the Menu Settings, set the ‘Display Location’ as ‘Primary Menu’. (Note you will need do this each time you choose a different template).
I suggest you do not select ‘Automatically add new top-level pages to this menu – as this makes managing the menu confusing.
Remember to ‘Save Menu’ after making changes.